单项选择题

Though computer has many advantages, it is by no means without its ______.

A．limitations
B．refrain
C．confinements
D．boundaries
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单项选择题
He was so ______ on his book that he didn't find her come in.
A．intent
B．absorbed
C．engrossed
D．devoted
单项选择题
I'm pleased with what you've given me and ______ you've done for me.
A．that
B．which
C．all that
D．all what
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